*{
    margin: 0px;
    padding: 0px;
}
body>div{
    width: 1200px;
}
body>div>div>div{
    border: 1px black solid;
}
body>div:nth-child(2){
    border: 1px black solid;
    margin: 10px 0;
}
body>div:nth-child(3)>div>div{
    width: 200px;
    height: 30px;
    text-align: center;
    line-height: 30px;
}
body>div:nth-child(3)>div>div>div{
    width: 50px;
    color: blue;
}
body>div:nth-child(3)>div>div>div:hover{
    cursor: pointer;
}
.red{
    color:red;
}